package com.atguigu.springcloud.lb;

import org.springframework.cloud.client.ServiceInstance;
import org.springframework.stereotype.Component;

import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;


@Component
public class MyLB implements LoadBalancer {

    private AtomicInteger atomicInteger = new AtomicInteger(0);            //元子类默认为0

    public final  int getAndIncrement(){
        int current;
        int next;
        do {
            current =this.atomicInteger.get();
            next=current>=2147483647 ? 0:current+1;
        }while (!atomicInteger.compareAndSet(current,next));
        System.out.println("*******************第几次访问次数，次数next:"+next);
        return next;
    }

    @Override
    public ServiceInstance instances(List<ServiceInstance> serviceInstances) {
      int index=  getAndIncrement() % serviceInstances.size();
        return serviceInstances.get(index);
    }
}
